breach splinter don't combine into breachstone when stacked to 300 in currency tab

I'm having the same problem!! I have taken my breech splinters out of stash into my inventory unstack them stacked them back and they are still not turning into a breach Stone. I have tried it in my stash regular tab and inventory my inventory and still will not turn into a breach Stone.

I am not able to get my 300 stack to combined to a breach stone. Is this a known bug?

It's been almost a year and it's still bugged. I tried the suggested unstack then stack but no avail.

Is there any resolution for this one?