[FS#1385] Unable to set up repeater on DFS-channel

[LEDE Bugs]

The following task has a new comment added:

FS#1385 - Unable to set up repeater on DFS-channel
User who did this - Ales Vizdal (ales)

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I can confirm the same issue for TP-Link RE355. Apart from hostapd (regardless wpad-mini, wpad or hostapd), it may be also related to the ath10k kernel driver.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1385#comment4496