Latest version incompatible with latest Jenkins

### Jenkins and plugins versions report

Environment

```text
Jenkins: 2.558
OS: Windows Server 2019 - 10.0
Java: 21.0.9 - SAP SE (OpenJDK 64-Bit Server VM)
---
ansicolor:536.v13fa_b_860c267
ant:520.vd082ecfb_16a_9
antisamy-markup-formatter:173.v680e3a_b_69ff3
apache-httpcomponents-client-4-api:4.5.14-269.vfa_2321039a_83
apache-httpcomponents-client-5-api:5.6-191.vb_47e2b_41c698
artifactory:4.0.8
asm-api:9.9.1-189.vb_5ef2964da_91
authentication-tokens:1.144.v5ff4a_5ec5c33
azure-sdk:259.vf079c96088a_f
bootstrap5-api:5.3.8-895.v4d0d8e47fea_d
bouncycastle-api:2.30.1.83-289.v8426fcd19371
branch-api:2.1280.v0d4e5b_b_460ef
build-timeout:1.40
build-user-vars-plugin:214.va_eed2ed849ca_
bunzl-azure:0.6.1
caffeine-api:3.2.3-194.v31a_b_f7a_b_5a_81
checks-api:402.vca_263b_f200e3
cloudbees-folder:6.1079.vc0975c2de294
command-launcher:134.v025a_5fcf9dea_
commons-collections4-api:4.5.0-8.va_d5448ef9011
commons-compress-api:1.28.0-3
commons-httpclient3-api:3.1-3
commons-lang3-api:3.20.0-109.ve43756e2d2b_4
commons-text-api:1.15.0-218.va_61573470393
conditional-buildstep:1.5.0
config-file-provider:1006.vc7366c201f57
confluence-pipeline-steps:0.3.3
copyartifact:795.ve8e151429b_27
credentials:1502.v5c95e620ddfe
credentials-binding:719.v80e905ef14eb_
cucumber-reports:5.10.2
cucumber-trends-report:1.3
custom-view-tabs:1.3
dark-theme:652.vea_da_dfea_e769
data-tables-api:2.3.7-1534.v539d4edf109d
display-url-api:2.217.va_6b_de84cc74b_
durable-task:664.v2b_e7a_dfff66c
echarts-api:6.0.0-1247.vf3e35a_c1813f
eddsa-api:0.3.0.1-29.v67e9a_1c969b_b_
external-monitor-job:223.vb_fddcf42c9b_3
file-operations:439.vdc9d3b_d74b_d9
font-awesome-api:7.2.0-965.ve3840b_696418
git:5.10.1
git-client:6.6.0
git-parameter:462.vdcf3df2ed2ca_
gitlab-steps:0.4.0
gradle:2.19.1244.v1f9866817fec
groovy:537.v741a_5a_f1b_581
gson-api:2.13.2-173.va_a_092315913c
htmlpublisher:427
http_request:1.25
instance-identity:203.v15e81a_1b_7a_38
ionicons-api:94.vcc3065403257
jackson2-api:2.21.2-433.v6d50b_92cfe52
jackson3-api:3.1.1-68.v2a_4b_025ea_657
jakarta-activation-api:2.1.4-1
jakarta-mail-api:2.1.5-1
jakarta-xml-bind-api:4.0.6-12.vb_1833c1231d3
javadoc:354.vee1a_660b_4990
javax-activation-api:1.2.0-8
javax-mail-api:1.6.2-11
jaxb:2.3.9-143.v5979df3304e6
jdk-tool:83.v417146707a_3d
jersey2-api:2.48-180.ve47b_264f849b_
jira-steps:2.1.185.vf95b_e8a_f13fe
jjwt-api:0.11.5-120.v0268cf544b_89
job-dsl:3654.vdf58f53e2d15
job-parameter-summary:0.5
joda-time-api:2.14.1-187.vdf2def02b_8a_1
jquery:1.12.4-3
jquery3-api:3.7.1-619.vdb_10e002501a_
jsch:0.2.16-95.v3eecb_55fa_b_78
json-api:20251224-185.v0cc18490c62c
json-path-api:3.0.0-218.vcd4dd1355de2
jsoup:1.22.1-76.v9cdb_2456c0e3
junit:1403.vd9d1413fd205
mailer:534.v1b_36f5864073
matrix-auth:3.2.9
matrix-project:870.v9db_fcfc2f45b_
maven-plugin:3.27
mina-sshd-api-common:2.16.0-167.va_269f38cc024
mina-sshd-api-core:2.16.0-167.va_269f38cc024
nested-view:241.v178f0b_a_cd76a_
netty-api:4.1.130.Final-24.ve7c35ce81a_b_d
okhttp-api:5.3.2-200.vedb_720a_cf1f8
oss-symbols-api:442.v99039087229b_
pam-auth:1.12
parameter-separator:334.v1fc0e534c71d
parameterized-trigger:890.vc240a_a_e1217f
pipeline-aggregator-view:122.v3fe0b_415385e
pipeline-build-step:584.vdb_a_2cc3a_d07a_
pipeline-graph-analysis:254.v0f63a_a_447dca_
pipeline-groovy-lib:787.ve2fef0efdca_6
pipeline-input-step:551.vdff487c5998c
pipeline-milestone-step:152.v6e22b_8cfc66c
pipeline-model-api:2.2277.v00573e73ddf1
pipeline-model-definition:2.2277.v00573e73ddf1
pipeline-model-extensions:2.2277.v00573e73ddf1
pipeline-rest-api:2.39
pipeline-stage-step:345.va_96187909426
pipeline-stage-tags-metadata:2.2277.v00573e73ddf1
pipeline-stage-view:2.39
pipeline-utility-steps:2.20.0
plain-credentials:199.v9f8e1f741799
plugin-util-api:6.1192.v30fe6e2837ff
powershell:185.v7a_026da_c54ee
prism-api:1.30.0-703.v116fb_3b_5b_b_a_a_
rebuild:338.va_0a_b_50e29397
resource-disposer:0.25
run-condition:276.v97298f3a_cd51
saml:4.595.vec7523b_5d543
scm-api:728.vc30dcf7a_0df5
script-security:1399.ve6a_66547f6e1
skip-certificate-check:50.vcfa_cdb_b_27312
snakeyaml-api:2.5-149.v72471e9c6371
snakeyaml-engine-api:3.0.1-5.vd98ea_ff3b_92e
ssh-credentials:372.va_250881b_08cd
ssh-steps:2.0.92.vb_a_0583935f9b_
sshd:3.384.vc89b_5e138cf9
structs:362.va_b_695ef4fdf9
theme-manager:327.v780d7096ec29
timestamper:1.30
token-macro:477.vd4f0dc3cb_cf1
trilead-api:2.284.v1974ea_324382
uno-choice:2.8.9
update-sites-manager:91.v38ff0407cb_a_d
variant:70.va_d9f17f859e0
woodstox-core-api:7.1.1-1.v4d297985f397
workflow-aggregator:608.v67378e9d3db_1
workflow-api:1413.v2ff1a_5e720fa_
workflow-basic-steps:1098.v808b_fd7f8cf4
workflow-cps:4275.vb_0565eb_a_3d36
workflow-durable-task-step:1475.ved562f6ec8b_3
workflow-job:1573.v1465f6f78810
workflow-multibranch:821.vc3b_4ea_780798
workflow-scm-step:466.va_d69e602552b_
workflow-step-api:724.v538c2362b_dfb_
workflow-support:1015.v785e5a_b_b_8b_22
ws-cleanup:0.49

```

When I update theme-manager plugin to the latest version, Jenkins does not start correctly. Trying to access it results in 500 errors, stemming from jackson3 classes being loaded instead of jackson2 required by Jenkins itself - and jackson3 classes are not backwards compatible with jackson2.

Downgrading theme-manager plugin to previously installed version (from October 2025) resolves the issue.

Note, there are other plugins that depend on jackson3 - but none of them causes Jenkins to fail.

### What Operating System are you using (both controller, and any agents involved in the problem)?

Windows server 2019

### Reproduction steps

Install latest LTS Jenkins, install plugin theme-manager, restart jenkins.

### Expected Results

Jenkins starts up, I can access and use it.

### Actual Results

Jenkin does not start up correctly. Accessing it results in 500 System Error.

### Anything else?

Removing theme-manager plugin resolves the issue.

### Are you interested in contributing a fix?

_No response_