With a laptop W10 + TPM enabled with hard drive partitioned with C: = system; d: = users; e: = media; f: = the rest - all partitions BitLocker encrypted, all working beautifully well, I have an odd behaviour: after each W10 full startup, the partition e: needs to be opened by input of password asked. It works normally for all other partitions.

This is after migrating from W7 to W10 without clean install.
In W7, all was working well also but without the oddity.

I don't remember activating something special for e: different from other partitions.

Is there a parameter buried somewhere that regulates this behaviour? Or is the simple way out to decrypt then encrypt again?
Not a burning issue of course.