TL-WR1043ND v2 – Slow WLAN download when isolate clients active

The title basically says it all: For my WLAN the option isolate clients has been active since a long time. Recently, most likely with installing v19.07.5 or later, my WLAN download speed dropped significantly. It was 20–25 Mbit/s before (which is ok for my old devices) and it went down to ~3 Mbit/s. When I change this single option (deactivate isolate clients) it goes up again to 20–25 Mbit/s. On the other hand, upload speed is consistent over all settings at ~10 Mbit/s which is fine.

It's not the device – I tried 2 different ones with the same result: laptop and mobile phone.
Other things I tried to change but had no effect: Operating frequency – channel / mode / width (2.4 GHz is my only option), transmit power, WMM, WLAN antennas

Does anyone have any idea what's happening here or how to solve this? Is this a bug I should report?

Any help is greatly appreciated. Thanks.

Nevermind, installing v21 fixed it.

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