Existing tags not appearing when start typing in create article

[astrodene]

Steps to reproduce the issue

open a new article and start typing a known tage into the tag box

Expected result

a filtered list of tags appears getting more accurate the more you type

Actual result

an unfiltered list of 30 exiting tags appears which stays the same until you have typed 3 letters after which no tags appear

System information (as much as possible)

5.2.0. Updated from previous release version

Additional comments

[fgsw]

Which Joomla-Version? Is it a fresh install, an update …?

[astrodene]

5.2.0. Updated from previous release version.

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[fgsw]

Can you give System Informations (as much as possible) in the opening comment so users get basic information at beginning of thread.