mt7621/mt7603e: station dump fails with 802.11s

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$ iw dev mesh24 station dump
failed to parse nested attributes!
failed to parse nested attributes!
$ iw dev mesh5 station dump
failed to parse nested attributes!
failed to parse nested attributes!

AP station dumps work.

Environment: openwrt from
mid January (4a90fdf6105e1517897aac1b451b73a54b3d9d0d), late march (fbef8bba038f5aff755e383025f0a8b34879aa5c), and very late march (b8609066893a399b6aabe4df2e80eed52336fc69) using the built-in radios of a cudy WR2100 (mt7621,).

The configuration always being:

config wifi-iface 'mesh5'                        
        option ifname 'mesh5'                    
        option network 'mesh5' 
        option encryption 'psk2+ccmp'              
        option mesh_id 'nom'                       
        option bssid '02:BA:CC:11:55:90'
        option key ',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,'        
        option mode 'mesh'                         
        option mesh_fwding '0'          
        option mesh_ttl '1'
        option device 'radio5'

alongside an AP per radio.

In the version from January (4a90fdf6105e1517897aac1b451b73a54b3d9d0d), it would work on at least one radio from time to time. Just wifi and reboot until it worked (seemingly random pattern).

Reproduce the failure with iw dev mesh24 station dump and iw dev mesh5 station dump on the mt7621/mt7603e radios, then compare it with the working AP station dump. Trace the driver and mesh station-dump path; done means mesh station dumps parse successfully instead of reporting nested-attribute errors.