Hard lumps in pumpkin flesh

Just cut up the last pumpkin that I grew and there were hard white lumps in the flesh that when cooked, remained hard and inedible.

Some of the lumps were a continuous layer through the centre of the flesh but not through the entire circumference.

Has anyone else come across this before and any ideas what might have caused it?

None of the other pumpkins that I grew had this issue.

Fed them to the chooks after they were cooked so didn't go to waste.

The flavour and texture of the unaffected parts were delicious.

I run into these from time to time. I call them tumours, but in reality they are possibly a form of scar tissue or response to pests or pathogens. Sometimes they are underneath an obvious wound or indentation in the rind.

I suppose I could  fire up a search engine....

Thanks Phil, I didn't notice any scars/indentations in the skin but wasn't looking that hard to be honest.

I did do a search of various phrases but didn't come up with any definitive answers.

Never encountered it before so was curious what might have caused them.

I've experienced this once last year with a Blue Jarrahdale type pumpkin I purchased.  It had no damage at all, but had a what I can only describe as a hard white layer in between layers of good flesh.  Even after cooking, it was still a hard chunk.  I don't know if it was genetic or environmental, but I posted about it here https://permies.com/t/197840/Mixed-Maxima-Squash-photos#1682329

You can't really tell from the photo, but the white hard area looks like a glare of light.  crescent shaped bottom right of the side view.

I know this doesn't help explain, but you're not alone...

Thanks Cy, your Jarrahdale pumpkin flesh looks similar to how my crown pumpkin was.

Will try to remember to report back if it recurs in any of next season's pumpkins.

Just planted a few seeds last week.