Hmm, a crash when trying to open the plugin GUI usually happens either because of graphics issues with a specific Linux distribution, or it's because of problems with the preset database.
If the database cannot be accessed, or if the location it resides in does not have the needed read&write permissions, then such a crash occurs.
But since you can open the plugins in Bitwig, both cases seem unlikely.
And yup, five seconds to close the GUI are weird.
So maybe it's a graphics issue in combination with the Linux version and the host.
Were the previous versions (rev. 8272) working fine in the same environment?