when i build up i take damage and if i build to high i die

hey mojang. i wanna report this bug that happens in minecraft bedrock that made me lose a lot of progress in my world, the bug happens when i build up, no matter where i am i take damage when i build up and if i build to high i just instantly die and it really gets me and my friends mad when we wanna do a big build project that requires us to build high so please mojang if you could fix this it would mean a lot to me my friends and the community. thank you and have a good day m8s