Filter operator splitregexp with parentheses and pipes throws RSOE on match

Example code:

\define re() (color)|(colour)ed

\define str() Something coloured

{{{ [<str>splitregexp<re>] }}}

The error is: Linked List only accepts string values, not undefined

Occurs in Chromium-based browsers (at least Brave) on https://tiddlywiki.com and https://tiddlywiki.com/empty.html, and on TiddlyDesktop with an empty TW. (Windows 10)

Also occurs in prerelease.

This should go to GH: Issues · Jermolene/TiddlyWiki5 · GitHub

Opened (here)