Same here with a 16" 2019 MBP - definitely seems like a T2 issue and clearing caches and other measures has no effect, this has been an issue for me since 10.15.5 and I'm still running that version as a consequence.
Different issue as the one above, but still to do with the BridgeOS update :/
Nov 11 21:04:52 Leos-MacBook-Pro-3 softwareupdated[741]: SoftwareUpdate: Preparing bridgeOS update for manual product at /var/folders/zz/zyxvpxvq6csfxvn_n00000s0000068/C/com.apple.SoftwareUpdate/localhost/AdoptedManual/macOSUpdCombo10.15.7.pkg
Nov 11 21:04:52 Leos-MacBook-Pro-3 softwareupdated[741]: SoftwareUpdate: request for status for unknown product _ManualUpdate
Nov 11 21:04:52 Leos-MacBook-Pro-3 softwareupdated[741]: Package Authoring Error: PackageInfo bundle reference found without top-level bundle definition. Bundle will be skipped: <bundle id="*"></bundle>
Nov 11 21:04:53 Leos-MacBook-Pro-3 softwareupdated[741]: SUBridgeOSUpdateManager: Starting bridgeOS update prepare for _ManualUpdate
Nov 11 21:05:45 Leos-MacBook-Pro-3 softwareupdated[741]: bridgeOS prepare summary: 17P5300 -> 17P6610, update = 17.16.16610.0.0, brain = 17.16.16610.0.0, variant = com.apple.bridgeOSCustomer, macOS = 19F101 (customer), project = BridgeOSInstall-72, userAuth = 0, prod fused = 1, model = j152fap, client = SoftwareUpdate, retries = 2, session = B163A066-307C-43CA-8751-572D55070A0D: Error Domain=BOSErrorDomain Code=205 "An error occurred during prepare." UserInfo={NSLocalizedDescription=An error occurred during prepare., UpdateBundleIdentifier=com.apple.bridgeOSCustomer, NSUnderlyingError=0x7ff10edde240 {Error Domain=BridgeOSSoftwareUpdateError Code=19 "MSU - 1041 (failed to perform limited firmware update);MSU - 30 (Query for AP nonce failed);" UserInfo={SystemPartitionSize=1979666432, MSUErrorCode=1041, MSUErrorDescription=failed to perform limited firmware update, NSLocalizedDescription=MSU - 1041 (failed to perform limited firmware update);MSU - 30 (Query for AP nonce failed);}}}
Nov 11 21:05:45 Leos-MacBook-Pro-3 softwareupdated[741]: SUBridgeOSUpdateManager: bridgeOS update prepare complete for _ManualUpdate
Nov 11 21:05:45 Leos-MacBook-Pro-3 softwareupdated[741]: SUBridgeOSUpdateManager: bridgeOS update prepare for _ManualUpdate failed: Error Domain=BOSErrorDomain Code=205 "An error occurred during prepare." UserInfo={NSLocalizedDescription=An error occurred during prepare., UpdateBundleIdentifier=com.apple.bridgeOSCustomer, NSUnderlyingError=0x7ff10edde240 {Error Domain=BridgeOSSoftwareUpdateError Code=19 "MSU - 1041 (failed to perform limited firmware update);MSU - 30 (Query for AP nonce failed);" UserInfo={SystemPartitionSize=1979666432, MSUErrorCode=1041, MSUErrorDescription=failed to perform limited firmware update, NSLocalizedDescription=MSU - 1041 (failed to perform limited firmware update);MSU - 30 (Query for AP nonce failed);}}}
Nov 11 21:05:45 Leos-MacBook-Pro-3 softwareupdated[741]: SoftwareUpdate: Error preparing bridgeOS update for manual product at /var/folders/zz/zyxvpxvq6csfxvn_n00000s0000068/C/com.apple.SoftwareUpdate/localhost/AdoptedManual/macOSUpdCombo10.15.7.pkg
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Fix was to reset the T2 chip in DFU mode on a Big Sur 11.0.1 Mac.