Code is underlined with message "cannot be resolved to a type" , but it's not true

[provide a description of the issue]
IDE is showing some classes as "cannot be resolved to a type" , but the class exists, the code compiles fine. And also every now and then typing, waiting, the error disappears and appears again.
Project : https://github.com/jonathanvila/tackle-pathfinder
Line with error now : https://github.com/jonathanvila/tackle-pathfinder/blob/508abe531f3958f9b829e4b1fbac26b2a59a5fd3/src/main/java/io/tackle/pathfinder/model/assessment/AssessmentSingleOption.java#L41

Environment

• Operating System: Fedora 33
• JDK version: OpenJDK 11.0.9
• Visual Studio Code version: 1.55.0
• Java extension version: Language Support for Java 0.76.0

Steps To Reproduce

1. Randomly it shows classes as cannot be resolved

[Please attach a sample project reproducing the error]
Project : https://github.com/jonathanvila/tackle-pathfinder
Please attach logs

LOG (today) Language Support extension :

[Error - 10:54:00] 13 Apr 2021, 10:54:00 Problems occurred when invoking code from plug-in: "org.eclipse.jdt.core".
null
java.lang.NullPointerException
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:62)
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:52)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:105)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDeltaChildren(MicroProfilePropertiesListenerManager.java:85)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:95)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.elementChanged(MicroProfilePropertiesListenerManager.java:76)
at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1755)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1743)
at org.eclipse.jdt.internal.core.DeltaProcessor.firePostChangeDelta(DeltaProcessor.java:1576)
at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1552)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyAndFire(DeltaProcessor.java:2273)
at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:2163)
at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:477)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:305)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:295)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:158)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:380)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1502)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:49)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

[Error - 10:54:00] 13 Apr 2021, 10:54:00 Exception occurred in listener of Java element change notification
null
java.lang.NullPointerException
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:62)
at org.eclipse.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI(JDTMicroProfileUtils.java:52)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:105)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDeltaChildren(MicroProfilePropertiesListenerManager.java:85)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.processDelta(MicroProfilePropertiesListenerManager.java:95)
at org.eclipse.lsp4mp.jdt.internal.core.MicroProfilePropertiesListenerManager$MicroProfileListener.elementChanged(MicroProfilePropertiesListenerManager.java:76)
at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1755)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1743)
at org.eclipse.jdt.internal.core.DeltaProcessor.firePostChangeDelta(DeltaProcessor.java:1576)
at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1552)
at org.eclipse.jdt.internal.core.DeltaProcessor.notifyAndFire(DeltaProcessor.java:2273)
at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:2163)
at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:477)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:305)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:295)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:158)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:380)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1502)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:49)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

LOG ( today ) Extension host :

[2021-04-13 10:59:48.903] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 10:59:48.903] [exthost] [error] Error: The request (id: 190057, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 10:59:52.521] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 10:59:52.521] [exthost] [error] Error: The request (id: 190077, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:02:12.706] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:02:12.706] [exthost] [error] Error: The request (id: 190239, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:02:53.107] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:02:53.107] [exthost] [error] Error: The request (id: 190389, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:04:18.872] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:04:18.873] [exthost] [error] Error: The request (id: 190531, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:06:43.284] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:06:43.284] [exthost] [error] Error: The request (id: 190841, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:06:43.288] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:06:43.288] [exthost] [error] Error: The request (id: 190845, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:06:43.289] [exthost] [error] [redhat.java] provider FAILED
[2021-04-13 11:06:43.290] [exthost] [error] Error: The request (id: 190849, method: 'textDocument/hover') has been cancelled
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76464
at /home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:76758
at Immediate. (/home/jonathan/.vscode/extensions/redhat.java-0.76.0/dist/extension.js:1:77117)
at processImmediate (internal/timers.js:456:21)
[2021-04-13 11:08:33.211] [exthost] [warning] TextEditor is closed/disposed
[2021-04-13 11:08:39.710] [exthost] [info] ExtensionService#_doActivateExtension vscode.npm {"startup":false,"extensionId":{"value":"vscode.npm","_lower":"vscode.npm"},"activationEvent":"onLanguage:json"}
[2021-04-13 11:08:39.711] [exthost] [info] ExtensionService#loadCommonJSModule file:///usr/share/code/resources/app/extensions/npm/dist/npmMain

Start by reproducing the report with the linked tackle-pathfinder project and inspect the stack trace at org.lsp4mp.jdt.core.utils.JDTMicroProfileUtils.getProjectURI, especially line 62. Trace the MicroProfilePropertiesListenerManager delta handling around the reported null pointer and the intermittent unresolved-type diagnostics. Done means the listener no longer fails and valid classes are not intermittently reported as unresolved.