This is a very strange policy of Gimp developers - for them only Gegl counts, which replace older plugins without looking at the fact that in this way they destroy the work of the authors of older plugins and scripts.
And to make things even weirder some of the old plugins are registered in the PDB but not in the menu.
The only solution is to supplement the missing plugins from Gimp 2.10.12 / 13 from the older version of Gimp (but how long they will work is hard to guess).
Between Gimp 2.10.12 and 2.10.13 another four plug-ins were removed.
Attached are all missing plugins:
Plug-ins added to Gimp 2.10.12:
1. alien-map.exe==============Colors/Map/Alien Map...
2. apply-canvas.exe===========Filters/Artistic/Apply Canvas...
3. blur-gauss.exe=============Filters/Blur/Gaussian Blur...
4. blur-gauss-selective.exe===Filters/Blur/Selective Gaussian Blur...
5. blur-motion.exe============Filters/Blur/Motion Blur...
6. bump-map.exe===============Filters/Map/Bump Map...
7. channel-mixer.exe==========Colors/Components/Channel Mixer...
8. color-rotate.exe===========Colors/Map/Rotate Colors...
9. color-to-alpha.exe=========Layer/Transparency/Color to Alpha... and Colors/Color to Alpha...
10. convolution-matrix.exe=====Filters/Generic/Convolution Matrix...
11. cubism.exe=================Filters/Artistic/Cubism...
12. deinterlace.exe============Filters/Enhance/Deinterlace...
13. displace.exe===============Filters/Map/Displace...
14. edge.exe===================Filters/Edge-Detect/Edge...
15. edge-laplace.exe===========Filters/Edge-Detect/Laplace...
16. edge-sobel.exe=============Filters/Edge-Detect/Sobel...
17. engrave.exe================Filters/Distorts/Engrave...
18. illusion.exe===============Filters/Map/Illusion...
19. lens-apply.exe=============Filters/Distorts/Apply Lens...
20. lens-distortion.exe========Filters/Distorts/Lens Distortion...
21. maze.exe===================Filters/Render/Pattern/Maze...
22. mosaic.exe=================Filters/Distorts/Mosaic...
23. noise-hsv.exe==============Filters/Noise/HSV Noise...
24. noise-randomize.exe========Filters/Noise/Hurl...
25. noise-rgb.exe==============Filters/Noise/RGB Noise...
26. noise-solid.exe============Filters/Render/Clouds/Solid Noise...
27. noise-spread.exe===========Filters/Noise/Spread...
28. pixelize.exe===============Filters/Blur/Pixelize...
29. plasma.exe=================Filters/Render/Clouds/Plasma...
30. polar-coords.exe===========Filters/Distorts/Polar Coordinates...
31. red-eye-removal.exe========Filters/Enhance/Red Eye Removal...
32. ripple.exe=================Filters/Distorts/Ripple...
33. shift.exe==================Filters/Distorts/Shift...
34. sinus.exe==================Filters/Render/Pattern/Sinus...
35. tile-glass.exe=============Filters/Artistic/Glass Tile...
36. value-propagate.exe========Filters/Distorts/Value Propagate...
37. video.exe==================Filters/Distorts/Video...
38. waves.exe==================Filters/Distorts/Waves...
39. wind.exe===================Filters/Distorts/Wind...
Plug-ins added to Gimp 2.10.13:
1. contrast-normalize.exe======Colors/Auto/Normalize
2. edge-neon.exe===============Filters/Edge-Detect/Neon (legacy)...
3. newsprint.exe===============Filters/Distorts/Newsprint
4. oilify.exe==================Filters/Artistic/Oilify (legacy)...
Script-fu "Clothify" requires plug-ins:
- blur-gauss.exe
- noise-rgb.exe
- bump-map.exe