Jumping Cursor in Gutenberg Editor

[pascalts]

While typing in a block / paragraph, the cursor jumps to the beginning of the paragraph. It happens while autosaving or language-correction. I testet Firefox 63, Edge and Chromium (all Windows 10). All WordPress-plugins were disabled, alls browser-plugins disabled. No mouse-movement at this moment, no keybord-buttons pressed.

This problem happens since the 5.0 update.

Video of the problem: ​https://youtu.be/yJ2qSLq9hMs

In the video: I type some text and wait. While waiting the cursor jumps to the start of the paragraph. If I go on writing, the text is written at the beginning.

[unsungher0]

I also had this issue using Version 70.0.3538.110 (Official Build) (64-bit) of Chrome on Mac OS.

[simply2moms]

We are experiencing the same problem. It began after updating to WP 5.0. And autosave occurs every 15 seconds so it has become impossible to use.

Replying to pascalts:

While typing in a block / paragraph, the cursor jumps to the beginning of the paragraph. It happens while autosaving or language-correction. I testet Firefox 63, Edge and Chromium (all Windows 10). All WordPress-plugins were disabled, alls browser-plugins disabled. No mouse-movement at this moment, no keybord-buttons pressed.

This problem happens since the 5.0 update.

Video of the problem: ​https://youtu.be/yJ2qSLq9hMs

In the video: I type some text and wait. While waiting the cursor jumps to the start of the paragraph. If I go on writing, the text is written at the beginning.

[Randy]

I experience this bug, but only with my Genesis theme (Mai Pro) active. When I switch to 2019, this bug goes away. I think this is a theme bug, not a core bug.

[JiveDig]

We traced the bug in Mai Theme back to an issue in CMB2 that has already been patched (in CMB2). It may be worth activating CMB2 (2.6) from the WP repo to see if the issue goes away. There are lots of factors in this issue, but many may be related to CMB2 since many themes/plugins use the library.

[bizanimesh]

Same issue...!!