P: Dropped frames in time lapse video

"I posted this bug because I feel that later revisions of software should have the same (or better) function as their predecessors unless otherwise documented."

I think the change in LR that degraded the ability to make timelapse videos occurred a number of years ago -- forum archaeology would probably reveal some posts, if you searched hard enough, but probably not worth the effort.

"I don't do enough time lapse to justify the cost."

You could probably use Photoshop to make the videos -- it's included in the cost of your LR Classic subscription. I did it once, though I got frustrated with the inaccuracy of the various recipes I found about how to do it.  As with most things in PS, it's a steeper learning curve.

There are lots of explanations out there about how to use the free command-line "ffmpeg" too.  I've got a shell-script that makes a timelapse from my weathercam, and I recall that it was moderately painful to make it work.  Here's the script, which I haven't run for several years:

#!/bin/sh
#-------------------------------------------------------------------------------
# 
# usage: make-video.sh <dir> <source-rate> <output-file>
# 
# Makes a time-lapse video from the .jpg files in <dir>, writing
# the video to <output-file>.  A <source-rate> of 30 will use all
# the .jpgs at 30 frames-per-second. A <source-rate> of 60 will use every
# other frame at 30 frames-per-second.
# 
#-------------------------------------------------------------------------------

if [ $# -lt 3 ]; then
    echo "usage: make-videosh <dir> <source-rate> <output-file>" > /dev/stderr
    exit 1
    fi
dir=$1
sourceRate=$2
outputFile=$3

ffmpeg -r $sourceRate -pattern_type glob -i "$dir/*.jpg" \
    -r 30 -s 3840x2160 -vcodec libx265 -crf 26 -tag:v hvc1 "$outputFile"