We're experiencing the same bug in D8 as the parent issue #1986306: Illegal choice 0 in grouped filters with Allow multiple selections → describes in D7.
When using a text field as an exposed grouped filter with the checkbox to allow multiple selections, I get the following error when trying to use the pager to go to the next page of results:
An illegal choice has been detected. Please contact the site administrator.
This shows up in the watchdog as:
Illegal choice 0 in field_presenter_last_name_value element.
Closed: outdated
11.0 🔥
Last updated
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Going through old issues for the Bug Smash Initiative.
Some work was done for checkboxes here #2651102: Using checkboxes for exposed filters results in zero rows displaying → also still some work to be done for dates in 🐛 Views exposed group filter (with option allow multiple selections) generates notices when using date and date range fields Needs work but not getting this error anymore so that part seems to have been fixed