Merge pull request #51644 from ChainedLupine/bugfix-stex-webp

editor/import/resource_importer_texture.cpp

@@ -218,7 +218,8 @@ void ResourceImporterTexture::get_import_options(List<ImportOption> *r_options,
 void ResourceImporterTexture::save_to_stex_format(FileAccess *f, const Ref<Image> &p_image, CompressMode p_compress_mode, Image::UsedChannels p_channels, Image::CompressMode p_compress_format, float p_lossy_quality) {
 	switch (p_compress_mode) {
 		case COMPRESS_LOSSLESS: {
-			bool lossless_force_png = ProjectSettings::get_singleton()->get("rendering/textures/lossless_compression/force_png");
+			bool lossless_force_png = ProjectSettings::get_singleton()->get("rendering/textures/lossless_compression/force_png") ||
+					!Image::_webp_mem_loader_func; // WebP module disabled.
 			bool use_webp = !lossless_force_png && p_image->get_width() <= 16383 && p_image->get_height() <= 16383; // WebP has a size limit
 			f->store_32(use_webp ? StreamTexture2D::DATA_FORMAT_WEBP : StreamTexture2D::DATA_FORMAT_PNG);
 			f->store_16(p_image->get_width());