Submitted by 0x52
Unclaimed fees from pool will be stuck.
When delisting a pool the pools reference is removed from address provider:
https://github.com/code-423n4/2022-05-backd/blob/2a5664d35cde5b036074edef3c1369b984d10010/protocol/contracts/Controller.sol#L63
Burning fees calls a dynamic list of all pools which no longer contains the delisted pool:
https://github.com/code-423n4/2022-05-backd/blob/2a5664d35cde5b036074edef3c1369b984d10010/protocol/contracts/RewardHandler.sol#L39
Since the list no longer contains the pool those fees will not be processed and will remain stuck in the contract
Call burnFees() before delisting a pool.
danhper (Backd) confirmed 
Alex the Entreprenerd (judge) commented:
For this contest, 42 reports were submitted by wardens detailing low risk and non-critical issues. The report highlighted below by IllIllI received the top score from the judge.
The following wardens also submitted reports: SmartSek, BowTiedWardens, SecureZeroX, berndartmueller, cccz, Ruhum, cryptphi, defsec, dipp, fatherOfBlocks, unforgiven, codexploder, Chom, bardamu, masterchief, Kumpa, 0x29A, c3phas, Funen, hansfriese, Picodes, shenwilly, WatchPug, 0xNazgul, 0x1f8b, Sm4rty, 0xf15ers, asutorufos, delfin454000, gzeon, hake, sach1r0, simon135, StyxRave, oyc_109, hyh, catchup, Kaiziron, MiloTruck, sashik_eth, and Waze.
