LanguageTool 5.2 on Writer LO 7.1 massive CPU load

Dear community,

Using LT 5.2 after a clean install and a user profile reset leads to a massive constant single core CPU load, even without typing. The problem occurs on blank documents too as soon as I start typing.
If I disable and enable LT again from the extension manager (without restarting) the load is gone until I type again.

Had anyone experienced this problem too?

OS: Ubuntu 20.04 (LO is in pre-release)

Which version of LO are you using?

Pre-release version of LO? What version exactly? Consider filing a bug report, this may be a new bug.

The stable version on 20.04 is the 6.4, but it is possible to install appimages as @Astur or add a ppa for the alpha and beta versions (backports).

I know that. This board is not intended for discussing or reporting bugs. If you test an alpha or beta version and find problems, you should report that at the bug tracker. See How to Report Bugs in LibreOffice - The Document Foundation Wiki for help with that. Also see Ask/Getting Started - The Document Foundation Wiki for how this board works, what kind of things you can ask here and how to post messages.

I clean and reinstall the official 7.1.1 and the problem is still there.

I cleaned and reinstalled the stable LO 7.1.1 and the problem is still there.