It looks like this has been fixed in the develop branch of WeBWorK (https://github.com/openwebwork/webwork2/blob/837aabf7d91eb065bbfbbe347228b615124ab1f1/lib/WeBWorK/ContentGenerator/Instructor/PGProblemEditor.pm#L2069-L2078), which means that it will be part of the next release.
WeBWorK Main Forum
Ctrl + F search and replace in PG editor
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