I found the funds! I just search the contract adress 0xC3621651c550F3c1BC146ffAe0975a566423Da17 on google and found ONE entry with lyra.finance. And yes, Ive sent the funds there to trade some bitcoin/eth options. Ive connected my wallet and the funds are there!
Thank you for your help!
PS: I also asked in a reddit forum and got some DMs that I should connect my wallet to an "wallet rectify" service... Sounds scammy and a quick google search confirmed that, haha!
I was going to suggest you contact Synapse since you said it says pending, although that did sound unlikely given that I can see you received the Arbitrum funds as I have shown you.
For DMs, you should probably ignore them. There are some services that help you "revoke permissions" you previously gave to sites.
An example:
https://revoke.cash/ (I have used this one before, but do your own research first)
You can connect your wallet, and revoke the permissions you gave before but this is only useful when you suspect that you've dealt with a scam site who might still be able to access your funds later on.