"enhanced" seekTarget and Caption Selection

Our (very) old version of Wowza (pre 4.x) has a bug where setting seekTarget to “enhanced” interferes with the caption selection in files with multiple subtitle streams.

After checking the public changelog since then, I didn’t find any fixes or changes for either of these two features. But I’m wondering if there might’ve been an internal fix for this that’s either undocumented or labeled differently in the public changelog. Is there such a fix, or is my best bet just trying out the latest Wowza version?