SDL2 primitive shapes don't render when SDL_ttf text is rendered

[Tam]

Version of emscripten/emsdk:

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.3 (c06156773675b2cb437e41459c12d44bd9a8f235)
clang version 14.0.0 (https://github.com/llvm/llvm-project d8f929a567083a6b90264193f1e4476f6b77c5fe)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /Users/tam/Developer/emsdk/upstream/bin

When text is rendered to the screen (viaTTF_RenderText_Blended, SDL_CreateTextureFromSurface, and SDL_RenderCopy) all calls to SDL's primitive shapes (i.e. SDL_RenderDrawRect) no longer appear and the following warning is logged to the console:

WebGL warning: drawArraysInstanced: Vertex fetch requires 96, but attribs only supply 6.

This isn't an issue when building to a native platform, and has no impact on rendering textures from image surfaces.