Cannot copy a Block to clipboard from a Stack on a page

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How to re-create the situation:
1. Go to Blocks & Stacks, create a Stack and add any block to it
2. Go to a page and add the Stack there
3. Click on the block (in the Stack) and select Copy to Clipboard
4. Click an area -> Add block -> Select "Clipboard" from the left side menu -> the block you just copied to Clipboard isn't there.

However, if you copy the block to the Clipboard from the Blocks & Stacks view, it is actually copied there and can be used.


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.3.2
Version Installed - 8.3.2
Database Version - 20180122213656

# concrete5 Packages
Database Migration (0.9.5), Lounas (0.3.0.1)

# concrete5 Overrides
blocks/autonav/templates/header_navigation.php, blocks/autonav/templates, blocks/autonav, blocks/form/templates/scirocco_form.php, blocks/form/templates, blocks/form/view.css, blocks/form, blocks/image/templates/laskeutumissivun_otsikko/view.php, blocks/image/templates/laskeutumissivun_otsikko, blocks/image/templates/reunustettu_kuva/view.php, blocks/image/templates/reunustettu_kuva, blocks/image/templates, blocks/image, blocks/page_list/templates/ravintolat_lista/view.php, blocks/page_list/templates/ravintolat_lista, blocks/page_list/templates, blocks/page_list, blocks/switch_language/templates/scirocco/view.php, blocks/switch_language/templates/scirocco, blocks/switch_language/templates, blocks/switch_language, themes/scirocco/css/bootstrap-3.3.6/bootstrap.min.css, themes/scirocco/css/bootstrap-3.3.6, themes/scirocco/css/juhlalounas.css, themes/scirocco/css/scirocco.css, themes/scirocco/css, themes/scirocco/default.php, themes/scirocco/description.txt, themes/scirocco/elements/footer.php, themes/scirocco/elements/footer_menu.php, themes/scirocco/elements/header.php, themes/scirocco/elements/header_menu.php, themes/scirocco/elements, themes/scirocco/home.php, themes/scirocco/images/logo.png, themes/scirocco/images/logo_big.png, themes/scirocco/images/logo_medium.png, themes/scirocco/images/old-paper.jpg, themes/scirocco/images/SV_AA_logo_Dimoji_Oy_Ravintola_Scirocco_fi.png, themes/scirocco/images/tausta_pattern.jpg, themes/scirocco/images/VWC-Espoo.jpg, themes/scirocco/images/VWC-Helsinki.jpg, themes/scirocco/images, themes/scirocco/js/matchheight.js, themes/scirocco/js, themes/scirocco/lander.php, themes/scirocco/menu.php, themes/scirocco/page_theme.php, themes/scirocco/thumbnail.png, themes/scirocco/view.php, themes/scirocco, tools/pdf.php

# 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 6 hours (default setting).

# Server Software
Apache/2.4.18 (Win64) PHP/7.1.10

# Server API
apache2handler

# PHP Version
7.1.10

# PHP Extensions
apache2handler, bcmath, bz2, calendar, com_dotnet, Core, ctype, date, dom, exif, fileinfo, filter, gd, gettext, gmp, hash, iconv, imap, intl, json, ldap, libxml, mbstring, mcrypt, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, readline, Reflection, session, SimpleXML, soap, sockets, SPL, sqlite3, standard, tokenizer, wddx, xdebug, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend OPcache, zip, zlib

# PHP Settings
max_execution_time - 240
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 2500
memory_limit - 128M
post_max_size - 8M
sql.safe_mode - Off
upload_max_filesize - 2M
ldap.max_links - Unlimited
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
soap.wsdl_cache_limit - 5
xdebug.max_nesting_level - 256
xdebug.max_stack_frames - -1
xdebug.var_display_max_children - 128
xdebug.var_display_max_data - 512
xdebug.var_display_max_depth - 3
opcache.max_accelerated_files - 10000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0