External form block doesn't work

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I added External Form block to the page, then select default template (test form).

In Source Code of the page I see the wrong action-url, like this:
<form method="post" action="http://concrete5-850.loc/index.php/ccm/system/block/action/edit/1/Main/182/test_search">...</form>


In previous version of concrete5 the action-url looks:
<form method="post" action="http://concrete5-850.loc/index.php/test_search/182">...</form>



When I tried to send form, then I see the blank white page and nothing happens.


UPD: github issue
https://github.com/concrete5/concrete5/issues/7657...


Status: New
concrete5russia

concrete5 Environment Information

# concrete5 Version
Core Version - 8.5.0
Version Installed - 8.5.0
Database Version - 20190301133300

# concrete5 Packages
None

# concrete5 Overrides
None

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
apache2handler

# PHP Version
7.1.22

# PHP Extensions
apache2handler, bcmath, bz2, calendar, Core, ctype, curl, date, dom, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, igbinary, imap, json, libxml, mbstring, mcrypt, mongodb, mysqli, mysqlnd, odbc, openssl, pcre, PDFlib, PDO, pdo_mysql, pdo_pgsql, pdo_sqlite, Phar, readline, redis, Reflection, session, SimpleXML, soap, sockets, SPL, sqlite3, standard, timezonedb, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 180
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 180
max_input_vars - 100000
memory_limit - 1536M
post_max_size - 100M
sql.safe_mode - Off
upload_max_filesize - 100M
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.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

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36