Issue #2786735 by recrit, eiriksm, ranjith_kumar_k_u, immaculatexavier, ravi.shankar, zaporylie, smustgrave, TrevorBradley, johnle, GaëlG, jefuri, alexpott, poker10: Image derivative generation does not work if effect "Convert" in use and file stored in private filesystem

Issue #3377310 by catch, joelpittet, mark_fullmer, smustgrave, TrevorBradley, bkosborne, MWaters, cilefen, capellic: 400 exceptions result from requests for old asset paths which are missing the "theme" query string, possibly from cached pages

Issue #2174633 by colan, mikeker, Lendude, Pancho, Jo Fitzgerald, tim.plunkett, andypost, anya_m, botanic_spark, amateescu, realityloop, tvhung, lokapujya, jhedstrom, rensingh99, dww, Munavijayalakshmi, david.gil, jlbellido, visabhishek, druprad, le72, larowlan, kenton.r, jonathanshaw, Damien Tournoud, mpp, alexpott, dawehner, nicholas.alipaz, TrevorBradley, jp.stacey, Berdir: View output is not used for entityreference options

Issue #3031128 by alexpott, TrevorBradley, indigoxela, catch, cilefen, larowlan, jibran: Update from 8.6.7 to 8.6.8 warnings - Drupal\Core\Extension\Extension has no unserializer

Issue #2913971 by jhedstrom, TrevorBradley, amateescu: Views regression: 8.4.x EntityField can't handle a null row value from a non-required relationship

Issue #2767643 by maxocub, TrevorBradley, sylus, heddn, mikeryan: Scalar to array migration returns NULL

Issue #1987400 by joelpittet, andypost, drupalninja99, jerdavis, CaptainWonky, shanethehat, TrevorBradley | Cottser: Forum.module - Convert theme_ functions to Twig.