[feat]: Do segwit related computations only after segwit upgrade

[m-kus]

• [x] issue #180
• [x] follows contribution guide
• [] code change includes tests

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Name	Status	Preview	Comments	Updated (UTC)
raito	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 15, 2024 9:56pm

[maciejka]

Fix conflicts, please.