When I change my project settings in Kdenlive to HD 1080p 24fps I expect the rendered video to also have 24fps. If I render the video using the WebM format setting the video renders as 1k fps. Running ffprobe shows a rendered video with these project settings as having 1k fps (you can test this by just making a colour clip video):

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Stream #0:0: Video: vp8, yuv420p(bt709/unknown/bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 1k fps, 46 tbr, 1k tbn, 1k tbc (default)

I'm not sure if this is a big deal but I can't determine if the rendered video truly is 24fps and I can't force rendering at 24fps even when adding fps=24 and r=24 to the parameters.
Using the MP4 setting seems to render videos at the correct frame rate.

f=webm vcodec=libvpx acodec=vorbis crf=%quality vb=0 quality=good aq=%audioquality max-intra-rate=1000
[webm @ 0x7f0f900c6d80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.

f=webm acodec=vorbis vcodec=libvpx-vp9 crf=%quality vb=0 quality=good aq=%audioquality
[webm @ 0x7fe7b40c6d80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.