Gutenberg: Widgets Editor - Existing Widgets disappear when closing sidebar

[maddisondesigns]

Describe the bug
When I first enter the Widgets Editor, my main sidebar has a number of different widgets displayed. If you close the sidebar and then reopen it, they all disappear

Vid: https://share.getcloudapp.com/L1uJLZlW

To reproduce
Steps to reproduce the behavior:

1. Go to Widgets screen
2. Close a sidebar containing widgets and then reopen it
3. See widgets disappear

Expected behavior
My widgets shouldn't disappear

Editor version (please complete the following information):

• WordPress version: 5.5.1
• Does the website has Gutenberg plugin installed, or is it using the block editor that comes by default? Gutenberg plugin
• If the Gutenberg plugin is installed, which version is it? 9.0.0

Desktop (please complete the following information):

• OS: macOS Catalina 10.15.6
• Browser: Firefox 80.0.1

[annezazu]

@maddisondesigns I wasn't able to replicate this using WordPress 5.5.1 & Gutenberg 9.0. However, I was testing this by first adding blocks to the widget screen and then seeing if they appeared when checking the drop downs. Can you give a bit more information about whether these widgets existed before updating to Gutenberg 9.0 and if they are disappearing after? I did run into a problem with adding the classic block though so am going to leave this as needs testing for now: https://github.com/WordPress/gutenberg/issues/25595

[maddisondesigns]

@annezazu These widgets existed before updating to Gutenberg 9.0. This was the first time I've been to the new Widgets screen since updating the Gutenberg plugin to 9.0.

[annezazu]

Brilliant! I was able to replicate this. Changing this to a bug. Thanks for reporting :)

[adamziel]

Thank you for reporting! I just confirmed it's indeed a problem - this is specific to text widget, it seems like TinyMCE is getting removed once the tab is collapsed.

[adamziel]

And it's likely for the same reasons as new text widgets not getting properly initialized with TinyMCE.

[adamziel]

Merging https://github.com/WordPress/gutenberg/pull/25645 should have fixed the problem - I'm closing this issue. If you find the issue is still there, by all means please comment / reopen!