Can't import/export linked multiple VALUES

• Conflict of two features (each works well independently)
• Error

Hi,
Following a doc example, on a fresh TW21 docker install from tiki, I create 2 trackers:
1st has fields: name, sports (linked, multiple values)
2nd has fields: sport
entering 2 sports and 1 name with 2 practiced sports for the dude.

Now go to tiki-ajax_services.php?controller=tabular&action=create
and if you click "Initialize this format with the current tracker fields" (http://127.0.0.1/tiki-ajax_services.php?controller=tabular&action=edit&tabularId=4&prefill=1)
you get an error 382 according to Apache:

Fatal error: Uncaught Error: Call to a member function getMode() on null in /var/www/html/lib/core/Services/Tracker/TabularController.php:700 Stack trace: #0 /var/www/html/lib/core/Services/Tracker/TabularController.php(104): Services_Tracker_TabularController->getSchema(Array, true) #1 /var/www/html/lib/core/Services/Broker.php(108): Services_Tracker_TabularController->action_edit(Object(JitFilter)) #2 /var/www/html/lib/core/Services/Broker.php(28): Services_Broker->attemptProcess('tabular', 'edit', Object(JitFilter)) #3 /var/www/html/tiki-ajax_services.php(51): Services_Broker->process('tabular', 'edit', Object(JitFilter)) #4 {main} thrown in /var/www/html/lib/core/Services/Tracker/TabularController.php on line 700

I tried using old export function and, instead of flattening the values to a comma list, it exports to CSV with "Array" in place of the linked values.

I also tried to make a tabular, then manually change field definition to "multiple values" and it threw an error about "Field mode" and it removes the field.

Maybe I do it wrong, how to export (and import) linked fields with multiple values?

It looks like mode is in working for item_list relating to a item_link field, but it only shows the first value

Best fix qould be with option like item_list field where you can specify format like %0,%1 or %0,%1 or else, to choose the way to export and import nested values.

Thank you!

EDIT: Visit
http://philmzo-11996-7378.show2.tikiwiki.org/tiki-ajax_services.php?controller=tabular&action=edit&tabularId=1&prefill=1
for the problem on TW21

1. Itemlink

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org

This bug has been demonstrated on show.tikiwiki.org

Please demonstrate your bug on show.tikiwiki.org