I see that you're using Electrum based from your other posts,
And there's one niche case where you could expose that you're using Electrum, and opened a lightning channel.

It's too specific but you might want to be informed:
Only possible if you're using the setting "Create recoverable channels" then opened a channel (setting only available for newly created/restored wallets).
Someone who's monitoring you could tell that it's from Electrum and it's an "Open Channel Transaction", based from the "extra data" Electrum included in the "funding transaction".
That's if he already know that the spent input is yours.

Release Notes | 4.1.0 - Recoverable channels (option): /spesmilo/electrum/blob/master/RELEASE-NOTES#L82-L101

For other use-cases, same as the posts above.