bash – FFmpeg command not producing desired video duration from image sequence

I have a set of 5 images and I want to use FFmpeg to create a video sequence from them. I am using the following command to achieve this:

ffmpeg -pattern_type glob -i '*_0[0-5].png' -r 25 -t 8 -c:v libx264 -pix_fmt yuv420p output.mp4

Based on my calculations, this command should output a video sequence that lasts 8 seconds, with each image lasting 1.6 seconds (or 40 frames at a frame rate of 25 fps). However, when I run the command, it produces a video sequence that lasts only 5 frames, with each image lasting only one frame.

I am running this command on MacOS using Bash.