Alert rules: locations list is ignored

If I enter a location in the scribbled area (see screenshot),

the location will be ignored and the Alert Rule will be executed for all devices. Using single devices entries here instead works, they will be included/excluded as expected.

These are the software-versions installed:

Version |21.4.0-59-gbb39b4a - Mon May 03 2021 16:48:15 GMT+0200|
Database Schema |2021_04_08_151101_add_foreign_keys_to_port_group_port_table (208)|
Web Server |nginx/1.16.1|
PHP |7.3.27|
Python |3.6.12|
MySQL |5.7.30-33|
Laravel |8.40.0|
RRDtool |1.7.1|