Why can't there be a metal-metal multiple bond in .... ?

Chemist20

[Re2OCl10] 4-

Each Re has an octahedral geometry basically, with 5 Cl- attached to it. It also has a bridging O, which bridges the two Re together.

O also produces pi donation to each Re, so that there is basically a double bond between Re-O

But still... which can't there be a bond between the Re? there are unpaired electrons which can be paired by making this bond!!!! Can there be metal-ligand and metal-metal multiple bonding in the same molecule?

thank you!