Bruteforce login prevention doesn't work

Hi to all, according to this link https://wiki.mikrotik.com/wiki/Bruteforce_login_prevention it could be possible to block unauthorized access like fail2ban.
I have **chr-**installed RouterOS https://download2.mikrotik.com/routeros/6.44.3/chr-6.44.3.img.zip in a VPS and it works great!
At firt, it seemed to work properly, but after the fourteenth ban, the system simply stopped working.
Is it a limitation of the “FREE VERSION” ?
Thank for your help!
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Hey. Are you sure that all 5 rules added to your firewall section in right order? Like drop, blcklst, s3,2,1. Drop on the top and the stage 1 on the bottom.