Finally I ended using (it's also working for different languages of Recaptcha challenges) if someone searches for the same:
">CSS>iframe[src^=' https://www.google.com/recaptcha/api2/bframe ']>FRAME> >CSS>#recaptcha-verify-button"
Unfortunately during the process of trying to fix this, I uninstalled & re-installed BAS so everything is gone including those automatic backups.
Also, it's not a resource situation, I have tried to open the script on several machines, ranging from medium specs 6 core 32gb ram / SSD to 16 core 64gb ram 1TB SSD high end servers, its not based on resources.
Attached a sample script below that got corrupted.
