The oldest trick in the book grian obsidian on chest

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue. 

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue. 

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue. 

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue. 

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue. 

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue. 

This has been successfully reproduced by me in 21w13a, so please add 21w13a into the list so mojang knows its still an issue.