[FS#4009] MAC address override makes connection unusable

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Hanabishi (HanabishiRecca) 

Attached to Project - OpenWrt/LEDE Project
Summary - MAC address override makes connection unusable
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - OpenWrt 21.02.0 on ASUS RT-AC57U
When 'MAC address' option set:
{{https://forum.openwrt.org/uploads/default/original/3X/c/8/c8f2ba3846180e5268c17394c20c9170e3118bdb.png}}

Connection becomes unusable, introducing insane delays and speed drop. Websites barely can open.
This is also affects LAN ports. When connecting via such port even LuCI web interface struggles to open.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4009

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