webui shows CrashLoopBackOff confusingly

This seems like a regression or slightly different case of #4258

Steps to Reproduce

1. check out servantes
2. edit hypothesizer/app.py and add some gobbledygook to make it invalid python (I put asdf on the first line of the if __name__ == 'main' block)
3. tilt up hypothesizer
4. open the web ui
5. go to the hypothesizer resource view and click on "Errors (1)"

Expected Behavior

When the web ui error filter says there's an error and I click on it, it shows an error

Current Behavior

1. every time the pod crash loops, the filters at the top briefly flicker to "Errors (0) Warnings (1)" and then back to "Errors (1) Warnings(0)"
2. When I click on "Errors (1)", the log is blank.

Context

tilt doctor Output

$ tilt doctor
Tilt: v0.20.2-dev, built 2021-05-10
System: darwin-amd64
---
Docker
- Host: [default]
- Version: 1.41
- Builder: 2
---
Kubernetes
- Env: kind-0.6+
- Context: kind-kind
- Cluster Name: kind-kind
- Namespace: default
- Container Runtime: containerd
- Version: v1.18.2
- Cluster Local Registry: {Host:localhost:50380 hostFromCluster: SingleName:}
- ```

#### About Your Use Case
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Reproduce the issue with servantes/hypothesizer/app.py by making the Python invalid, then run tilt up hypothesizer and inspect the web UI resource view. Trace the Errors filter and selected log view; done means clicking “Errors (1)” shows the crash-loop error without the filter flickering.