LMS v8.3.0, Mon Sep 20 - Slim::Web::JSONRPC::requestMethod (455) -Bad params!

I've just updated from 8.20 to 8.3 latest nightly, the last line in my server log is as follows. It's not clear this is a problem, everything seems to be working, what should I do to get an idea where this error is coming from?

[21-09-20 12:15:11.8932] main::init (390) Starting Logitech Media Server (v8.3.0, 1632112497, Mon Sep 20 06:49:14 WEDT 2021) perl 5.014001 - MSWin32-x86-multi-thread
[21-09-20 12:15:15.6277] Slim::Utils::Misc::msg (1341) Warning: [12:15:15.6274] DBIx::Class::ResultSet::update_or_create(): Query returned more than one row. SQL that returns multiple rows is DEPRECATED for ->find and ->single at /<C:\PROGRA~2\SQUEEZ~1\server\SQUEEZ~3.EXE>Slim/Schema.pm line 1905
[21-09-20 12:15:15.9613] Slim::Utils::Misc::msg (1341) Warning: [12:15:15.9611] Constant subroutine Plugins::BBCSounds::ProtocolHandler::EINTR redefined at /<C:\PROGRA~2\SQUEEZ~1\server\SQUEEZ~3.EXE>Export er/Lite.pm line 56.
[21-09-20 12:15:15.9615] Slim::Utils::Misc::msg (1341) Warning: [12:15:15.9614] Constant subroutine Plugins::BBCSounds::ProtocolHandler::ECHILD redefined at /<C:\PROGRA~2\SQUEEZ~1\server\SQUEEZ~3.EXE>Export er/Lite.pm line 56.
[21-09-20 12:15:15.9617] Slim::Utils::Misc::msg (1341) Warning: [12:15:15.9616] Constant subroutine Plugins::BBCSounds::ProtocolHandler::EBADF redefined at /<C:\PROGRA~2\SQUEEZ~1\server\SQUEEZ~3.EXE>Export er/Lite.pm line 56.
[21-09-20 12:15:18.0181] Slim::Plugin::FullTextSearch::Plugin::_initPopular Terms (580) Fulltext index missing or outdated - re-building
[21-09-20 12:15:18.0183] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (475) Starting fulltext index build
[21-09-20 12:15:18.0185] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (479) Initialize fulltext table
[21-09-20 12:15:18.1427] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (492) Create fulltext index for tracks
[21-09-20 12:15:32.8151] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (502) Create fulltext index for albums
[21-09-20 12:15:36.6744] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (511) Create fulltext index for contributors
[21-09-20 12:15:37.1433] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (521) Create fulltext index for playlists
[21-09-20 12:15:37.7213] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (536) Optimize fulltext index
[21-09-20 12:15:37.9237] Slim::Plugin::FullTextSearch::Plugin::_rebuildInde x (551) Fulltext index build done!
[21-09-20 12:15:46.0731] Slim::Web::JSONRPC::requestMethod (455) Request failed with error: Bad params!