I can confirm I am also getting this issue.
I'm using the Decora template. and when I go to edit an item in page builder (within article manager - not within pagebuilder) I try to edit the addon and all rows, columns and addons disappear.
Possible solution
What I have found works is changing my editor to JCE editor in both the user level and also in Global Config - this seems to alleviate the issue.
I'm guessing it's a conflict with editors that use elements of tinyMCE as the the console error when this happens is
engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36 ReferenceError: tinyMCE is not defined
at t.value (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:49)
at t.value (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:49)
at commitLifeCycles (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)
at t (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)
at _ (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)
at w (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)
at batchedUpdates (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)
at Z (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)
at Pe (engine.js?0808dd08ad62f5774e5f045e2ce6d08b:36)