Hello,
it seems that your SFP-T with the S/N MTC230307WR is not a Juniper original SFP-T. 3rd party transceivers can work, but it is not guaranteed that they work. Sometimes there is some code change in newer JUNOS releases which prevent 3rd party transceivers to work. What sounds quite strange is that your interface works fine, but the transceiver is not showing up in the "show chassis hardware" output, this is almost impossible.
My personal experience is, that only original Juniper copper SFPs are working fine with Juniper devices (in contrary to fiber SFPs), 3rd party copper SFPs have huge problems.
If you want to check which Juniper copper SFPs are supported, you can find the full list here:
https://apps.juniper.net/hct/product/?prd=QFX5100