Good god man.
I wish you had recorded this mess just so I could see this. I feel your pain entirely as I've had quite a few annoying moments where I lost fights I was objectively winning by leaps and bounds all because of something like this. Except for me it's usually Round 3-5 and they've landed so many of these cumulative body shots, while absorbing everything on their block, that I've become a sad wobbly drunkard who's just waiting for them to leap in with another body shot and put me to sleep.
From Woodley to Rai Cho and that's usually because I'm the only one actually attacking with purpose.
They're just blocking and draining me. And they're able to block EVERYTHING, some of the ones I've played don't even use the head movement they just hold block and it somehow stays for them. You don't have enough stamina to throw a combo capable of breaking through the block without eating a counter strike. Especially with any class over Welterweight. I can't do it anywhere, but it's even worse there. Throwing more than 3 strikes at Middleweight usually takes most of your bar if none connect or if they block them all, so trying to actually break the block with a combo only sets you up for them to counter you once your stamina is gone.
That is not how this should work. The block should break down fast enough to not take more stamina than you have at the start of the fight. I've tried playing very conservative, sniper fights and still have this problem when my stamina is drastically higher than the opponent. Short of them moving from high to low block or moving their head, there's nothing I can do. I'm just waiting for them to stop blocking or I'm wasting energy. A solution would be to either decrease the stamina drained from combos landed on the block by some slight amount. Or to make the block break down at a faster speed, especially at higher weight classes. Heavyweights shouldn't be able to block 3+ combos in close range like that. Dodge them, back up, block one and sway, whatever the hell you wanna do. But it's frustratingly jarring to be standing in front of someone teeing off on their unbreakable block like it's Tekken.
Tekken doesn't have stamina. It can get away with block doing relatively no damage and being impenetrable. But not here. I'm sure that's not how this was intended to work, but that has been my experience so far and I've heard similar complaints from people anecdotally.