Asset delivered for block when theme provides the asset!!

Permalink 5 2 Browser Info Environment
My theme provides Font-Awesome 5.11.2 with v4 shims (from font-awesome) being added if the menu is visible. This isolates the theme from Concrete5's (rather out of date) font-awesome package. Yet, upon editing a feature block the block's requires override the provides of my theme and the asset is delivered, which causes problems on the UI.

My page_theme.php contains:

public function registerAssets()
$this->providesAsset('css', 'font-awesome');
$this->providesAsset('css', 'bootstrap/*');

The features block under both edit() and registerViewAssets() include the line $this->requiresAsset('css', 'font-awesome');

Chrome Developer mode network monitoring shows this asset being delivered when a new feature block is added. However, it should not be delivered as it is provided by the theme.

Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.5.1
Version Installed - 8.5.1
Database Version - 20190301133300

# concrete5 Packages
BSIP IRP (0.0.3), CoreBSP Catalyst theme. (0.2.3)

# concrete5 Overrides
blocks/feature/form.php, blocks/feature/view.php, blocks/feature, blocks/search/view.php, blocks/search, blocks/page_title/form_add_edit.php, blocks/page_title

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Every 1440 minutes.

# Server Software

# Server API

# PHP Version

# PHP Extensions
cgi-fcgi, Core, ctype, curl, date, dom, fileinfo, filter, gd, hash, iconv, json, libxml, mbstring, mysqli, mysqlnd, openssl, pcntl, pcre, PDO, pdo_mysql, Phar, posix, readline, Reflection, session, SimpleXML, SPL, standard, tokenizer, xml, xmlreader, xmlwriter, zip, zlib

# PHP Settings
max_execution_time - 60
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 128M
post_max_size - 8M
upload_max_filesize - 200M
mbstring.regex_stack_limit - 100000
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200

Browser User-Agent String

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36