Summary of Issue:

In Minecraft Java Edition, explosions are coded such that the chance a block drops as an item when destroyed is the inverse of the explosion power, which for larger explosions means you get less items. TnT and TnT minecarts are exempt from this however with a 100% drop chance.

In Minecraft Bedrock Edition, TnT is given only a 25% drop rate whilst all other explosions are exempt with a 100% drop rate.

Further Discussion:

This parity issue is really unfair to bedrock players, who recieve lower yields from using TnT in general applications for converting blocks to their items such as blast chambers, quarries and tunnel bores. Whilst in Java edition players are essentially punished for seeking out more powerful explosion sources which are generally more expensive to obtain than TnT. It would be a simple fix to just make it so that in both editions of the game all explosions drop 100% of blocks.