Lurker888 was saying a different thing.
Which drivers does your RB4011 (the wifi model) use?: https://mikrotik.com/product/rb4011igs_5hacq2hnd_in
Settings under /wireless or /wifi?
If I recall correctly in /wifi there is no "ap bridge" mode, only "ap".
Mixing /wireless with /wifi never worked, see the matrix here:
Wifi 4-address mode (station bridge) between wifi-qcom and wifi-mediatek
Wifi 4-address mode (station bridge) between wifi-qcom and wifi-mediatek - #10 by lurker888