So long as it’s a clean cut and the surrounding bark is not split or damaged it should be fine, it will heal naturally. If its a bit of a raggedy mess, better to cut it again cleanly and at the correct angle, if you can, than apply a sticking plaster, so to speak, over the top. I have lopped a few branches off a large Walnut, but a bit smaller diameter than yours - they were fine.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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Thinking now a days is to leave it to heal naturally.
https://deepgreenpermaculture.com/2019/07/07/tree-pruning-how-to-remove-tree-branches-correctly/