WorldServer: After applying Word Stemmer to a Term Database, removing the language selection and saving does not work

We have set uploaded the stemmers from the SDK Samples to WorldServer and they are now visible under Management > Administration > Customization when selecting Word stemmers:



Setting values for Configure Stemmers for Desired Languages in a term database under Management > Linguistic Tools Setup works fine:


We then open the term database options again, remove the Configure Stemmers for Desired Languages entries, and click Save:



But opening the term database settings one more time shows that the changes have not been saved:


And the Configure Stemmers for Desired Languages settings remain in the dbo.tdDatabaseStemmers table.

This is a cosmetic issue whereby clearing the values in the dropdown boxes under Configure Stemmers for Desired Languages and saving does not update the database. It does not affect whether With stemming or Without stemming is set under Indexing Options, and this functionality behaves as expected.
 

The Configure Stemmers for Desired Languages settings are not saved when they are changed to contain no values. This has no effect on whether or not stemming is enabled or disabled for the term database.

These articles might be relevant:

WorldServer - Are fuzzy matching or partial string matching supported for terminology hits when using Multiterm Term Databases instead?
Are fuzzy matching, or partial string matching supported for terminology hits in native WorldServer TermBases?
WorldServer - proposed TD entries are not being exported to Studio package
Where can I download the MultiTerm Integration Service installer for Trados GroupShare / WorldServer?
Term Recognition in Studio and Fuzzy Search in MultiTerm Desktop are not working