Adding ignore case modifier "(?i)" to search causes results to not load.

When performing this type of search, the "searching" loading graphic sits there and no results appear. It does show how time it took to find the results and the number of results so it does seem like it finds the matches.

For example, searching for "Payments" returns results but searching for "(?i)Payments" causes the search to hang.

Running this from a local Docker instance on Windows 10. Repository is from BitBucket.

Edit: Forgot to mention. Checking ignore case does work.