If you connect ports together on the same switch but the ports are in different vlans then no it shouldn't block but it is not a good thing to do because assuming those ports are access ports ie. not trunks you have effectively joined two vlans together.
There are certain designs where something like this is actually required though eg. if you use a firewall in L2 mode then you actually do want to join two vlans together but the vlans use the same IP subnet eg.
vlan 10 -> firewall -> vlan 11
where the IP subnet is 192.168.5.0/24 for both vlans.
The vlans are created on the same switch so you have to use two vlans because if you used just one on both sides you would actually create an STP loop.
So there are some designs where you do need to in effect join vlans together but they are the exception rather than the norm.
Just to clarify for a firewall in L3 mode (the more common) the above does not apply.
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