Yes, I know 1.7.10 support is fading fast these days, so just bear with me.

Have been working on a custom mod pack for a while now - we decided that we don't want the splash screen for Betweenlands to show up, so our config is distributed as follows

general {
    # If true, the main menu will be replaced by the Betweenlands main menu [default: true]
    B:"Betweenlands Main Menu"=false

The exact file is the 1.0.6 Alpha from Curseforge. Yes, am aware it's an Alpha.

When the mod is installed via a launcher like Technic, the file gets overwritten by the mod on first startup, and reverts the changes, thereby enabling the splash screen. The timestamp on the file matches the time that the game was first launched and not the time stamp of the file that was distributed with the mod zip.

Good news though is that in our case, the mod works great in the pack, so this is otherwise a minor annoyance. (and possibly a permanent one?)

It would appear that this was a transient issue with Technic over the weekend, as all players are reporting that the config file is being honored again, and I can reproduce.