2.7.4

• The two builder filters and the four helper functions now carry the gt_ prefix, matching everything else the plugin exposes: gt_page_blocks_builder_preview_injection, gt_page_blocks_builder_post_types, gt_page_blocks_builder_url(), gt_page_blocks_builder_post_types(), gt_page_blocks_builder_nonce_action() and gt_page_blocks_preview_nonce_action().
• Every old md_-prefixed name still works. The filters run immediately before their replacements, so the current one has the last word, and the functions delegate to theirs. Each points at its replacement under WP_DEBUG while in use and is silent otherwise, so existing snippets keep working and nobody gets a notice for a hook they never touched.
• gt_page_blocks_builder_nonce_action() still returns its original string. It identifies nonces already issued into open builder tabs and saved URLs, and renaming the value would invalidate them for nothing.