I haven't watched football yesterday evening, but from the EPG information Bundesliga 2 (HD) up to Bundesliga 5 (HD) have transmitted football matches of German's 2nd Bundesliga from 17:50 until 20:30. I only watched Sky Bundesliga HD 1 for some time what was decoded correctly.
I know Oscam und "not found" should be a direct response from the server.
As you see response time is 588ms (Bundesliga HD 4) and 2nd try 65ms (Bundesliga HD 5) = this request was transmitted to server and was answered.
Looks like for the 1st unsuccessful channel (Bundesliga HD 4) your server needs to query your cards, while your server was already aware that "Bundesliga HD 5" cannot be decoded and replied directly with "not found" (because this user or any other user has already tried to open Bundesliga HD 5 with no success).
The following log entries (not found with 1ms processing time) comes directly from the Oscam on client site - if Oscam gets a "not found" reply it normally does not send further ECMs at least not until you change the channel and switch back (depends on configuration but this would be default behavior I believe).
I know some broadcasters like Dorcel transmit something that cannot be decoded, but on germans Sky channels the broadcaster transmit absolutely nothing if the channel is not available. Your receiver response with a "channel not available" and bitrate is 0. So you find no entry in Oscam logfile because there is even no CAID transmitted which could be recognized but as you see in the logfile 4 CAIDs are detected what means the channel was active.
Lets hope Sky Bundesliga channels work fine this afternoon when 1st Bundesliga season starts
And lets pray that your Nagra/1833er Sky-cards have not already been disabled by Sky as they sent out new receivers and NDS cards (v.14 caid 098c) to most of their customers with no option for the customers to remain on Nagra.
Official statement of Sky Germany already claim, that Nagra will be disabled at least at the end of next year (most likely much earlier for normal/personal customers)