When walking or running and holding down the mouse button, while placing blocks, carpets, moss carpets, etc., no more than two or three blocks, carpets, moss carpets, etc. are placed. After the two or three materials are placed (while continuing to hold down the mouse button), subsequent blocks, carpets, moss carpets, etc. appear for a split second, then disappear and seem to add back to your inventory. This started occurring after the Spring 1.21.70 update.
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Iād like to amend my original post by mentioning that it also sometimes happens when placing blocks quickly, without holding down the mouse button continuously.
Has this happened to you while playing online or on realms? Or was it on single-player world?
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We're tracking this issue in MCPE-203831, so this ticket is being resolved and linked as a duplicate.
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This is not a duplicate request to MCPE-203831. When playing on Realms, I find that I cannot walk and hold down the mouse button to place blocks when building. I must click the mouse for placing each block where I want it, but not too fast, otherwise the block disappears and returns to my inventory. Up until the spring update, I was even able to run and lay carpet and blocks with no issues.

@[MCQA] v-wiktoriab Answering your question, this happens when playing on Realms. Minecraft v1.21.73
Same happened a lot for me too
This is just a straight problem to gameplay, should be fixed ASAP